A sterile rod designed to be implanted into the intramedullary canal of the residual femur after transfemoral (above-the-knee) amputation to function as a stabilizing bar for the connection of a specialized external prosthesis. It is designed to project beyond the femur but not through the skin so that a transcutaneous adaptor can be attached to the distal end to interface with the external prosthesis. It is typically composed of metal [e.g., cobalt-chrome (Co-Cr), titanium (Ti), stainless steel], has a porous surface intended to improve fixation by promoting bone ingrowth (osseointegration), and is available in a variety of diameters and lengths.